Armour-plated and Thick-skinned

Armour-plated adjective - Covered with heavy steel.

Thick-skinned and armour-plated are semantically related In some cases you can replace phrase "Thick-skinned" with "Armour-plated", this phrases are similar.

Thick-skinned adjective - Having or showing a lack of sympathy or tender feelings.

Armour-plated and thick-skinned are semantically related in tough topic. Sometimes you can use "Armour-plated" instead an adjective phrase "Thick-skinned".